Can I merge different edges
Based on the comments and the question i take it that you want to close the bottom area of the object and at the same time reduce the number of vertices to a minimum.

In that regard, i would do the following:


Go in edit mode -> edge selection
Select the edges that go along the long side ending at each side at
the n-gon
Press X and Delete the Edges
Now switch to vertex selection
Select the vertices at each side at the bottom edge of the n-gon, where the previously deleted edges were connected.
Press X and Dissolve Vertices
Now the left over edges can be used to create faces along the bottom area by selecting two edges and pressing F to fill the area between those.


All this sounds stretched and long, but once you know the steps it's done in a jiffy.

Here a little visual of the procedure:

I didn't go through all faces at the end, as it is just rinse and repeat.

A tip at the end, i would suggest to use the "F2"-add-on, that comes with Blender:

Makes it easier and faster while modeling.

Happy Blending